ALGIERS, Algeria – In a desert standoff deep in the Sahara, the Algerian army ringed a natural gas complex where Islamist militants hunkered down with dozens of hostages Wednesday night after a rare attack that appeared to be the first violent shock wave from the French intervention in Mali.

A militant group that claimed responsibility said 41 foreigners, including seven Americans, were being held after the assault on one of oil-rich Algeria’s energy facilities, 800 miles from the capital of Algiers and 1,000 miles (1,600 kilometres) from the coast. Two foreigners were killed.

The group claiming responsibility said the attack was in revenge for Algeria’s support of France’s military operation against al-Qaida-linked rebels in neighbouring Mali. The U.S. defence secretary called it a “terrorist act.”

The militants appeared to have no escape, with troops surrounding the complex and army helicopters clattering overhead.

The group — called Katibat Moulathamine or the Masked Brigade — phoned a Mauritanian news outlet to say one of its affiliates had carried out the operation at the Ain Amenas gas field, and that France should end its intervention in Mali to ensure the safety of the hostages.

BP, the Norwegian company Statoil and the Algerian state oil company Sonatrach, operate the gas field. A Japanese company, JGC Corp, provides services for the facility as well.

In Rome, U.S. Defence Secretary Leon Panetta declared that the U.S. “will take all necessary and proper steps” to deal with the attack in Algeria. He would not detail what such steps might be but condemned the action as “terrorist attack” and likened it to al-Qaida activities in Pakistan, Afghanistan and in the United States on Sept. 11, 2001.

Algeria’s top security official, Interior Minister Daho Ould Kabila, said that “security forces have surrounded the area and cornered the terrorists, who are in one wing of the complex’s living quarters.”

He said one Briton and one Algerian were killed in the attack, while a Norwegian and two other Britons were among the six wounded.

“We reject all negotiations with the group, which is holding some 20 hostages from several nationalities,” Kabila said on national television, raising the spectre of a possible armed assault to try to free the hostages.

The head of a catering company working on the base told the French Journal de Dimanche that helicopters were flying over the complex and the army waited outside. There were even reports of clashes between the two sides and a member of the militant group told the Mauritanian news outlet the Islamists had already repelled one assault by Algerian soldiers late Wednesday night.

It was not immediately possible to account for the discrepancies in the number of reported hostages. Their identities also were not clear, but Ireland announced that they included a 36-year-old married Irish man. Japan, Britain and the U.S. said their citizens were taken. A Norwegian woman said her husband called her saying that he had been taken hostage.

Hundreds of Algerians work at the plant and were also captured in the attack, but the Algerian state news agency reported they were gradually released unharmed Wednesday.

The Algerian minister said it seemed the militants were hoping to negotiate their departure from the area — a notion he rejected. He also dismissed theories that the militants had come from Libya, a mere 60 miles (100 kilometres) away, or from Mali, more than 600 miles (1,000 kilometres) away.

Kabila said the roughly 20 well armed gunmen were from Algeria itself, operating under orders from Moktar Belmoktar, al-Qaida’s strongman in the Sahara.

In Washington, U.S. State Department spokeswoman Victoria Nuland confirmed that “U.S. citizens were among the hostages.”

The caller to the Nouakchott Information Agency, which often carries announcements from extremist groups, said the kidnapping was carried out by “Those Who Signed in Blood,” a group created to attack countries participating in the offensive against Islamist groups in Mali.

The Masked Brigade was formed by Belmoktar, a one-eyed Algerian who recently declared he was leaving the terror network’s Algerian branch, al-Qaida in the Islamic Maghreb, to create his own group. He said at the time he would still maintain ties with the central organization based in Afghanistan and Pakistan.

The name of his group could be a reference to the nomadic Tuareg inhabitants of the Sahara, known for masking their faces with blue veils.

A close associate of Belmoktar blamed the West for France’s recent air and ground intervention against Islamist fighters in Mali.

“It’s the United Nations that gave the green light to this intervention and all Western countries are now going to pay a price. We are now globalizing our conflict,” Oumar Ould Hamaha told The Associated Press by telephone Wednesday night from an undisclosed location.

French President Francois Hollande launched the surprise operation in Mali, a former French colony in West Africa, on Friday, hoping to stop the al-Qaida-linked and other Islamist extremists whom he believes pose a danger to the world.

Further kidnappings could well be on the horizon, warned Sajjan Gohel, the international security director for the Asia-Pacific Foundation.

“The chances are that this may not be a one-off event, that there could be other attempts in Africa — especially north and western Africa — to directly target foreign interests,” he said. “It’s unclear as to what fate these individuals may meet, whether these terrorists are going to want a ransom or whether they’ll utilize this for propaganda purposes.”

Wednesday’s attack in Algeria began with an ambush on a bus carrying employees from the massive gas plant to the nearby airport but the attackers were driven off, according to the Algerian government, which said three vehicles of heavily armed men were involved.

“After their failed attempt, the terrorist group headed to the complex’s living quarters and took a number of workers with foreign nationalities hostage,” the government said in a statement.

Attacks on oil-rich Algeria’s hydrocarbon facilities are very rare, despite decades of fighting an Islamist insurgency, mostly in northern Algeria.

In the last several years, however, al-Qaida’s influence in the poorly patrolled desert of southern Algeria and northern Mali and Niger has grown and the group operates smuggling and kidnapping networks throughout the area. Militant groups that seized control of a vast section of northern Mali last year already hold seven French hostages as well as four Algerian diplomats.

Prime Minister David Cameron’s office said “several British nationals” were involved, while Japanese news agencies, citing unnamed government officials, said there are three Japanese hostages.

“I want to say this is unforgivable,” said Japanese Prime Minister Shinzo Abe, who was travelling from Vietnam to Thailand on Thursday as part of a Southeast Asian tour.

“Our first priority is to protect their lives,” Abe said of the hostages. Japanese and U.S. officials were meeting in Tokyo to co-operate in resolving the crisis, and Defence Minister Itsunori Onodera called for close exchange of information between the two governments.

Late Wednesday, Statoil said five employees —four Norwegians and a Canadian — were safe at an Algerian military camp and two of them had suffered minor injuries. It said 12 employees were unaccounted for.

The Norwegian newspaper Bergens Tidende said a 55-year-old Norwegian working on the site called his wife to say he had been abducted.

Algeria had long warned against any military intervention against the rebels in northern Mali, fearing the violence could spill over its own long and porous border. Though its position softened slightly after Hollande visited Algiers in December, Algerian authorities remain skeptical about the operation and worried about its consequences on the region.

Algeria, Africa’s biggest country, has been an ally of the U.S. and France in fighting terrorism for years. But its relationship with France has been fraught with lingering resentment over colonialism and the bloody war for independence that left Algeria a free country 50 years ago.

Algeria’s strong security forces have struggled for years against Islamist extremists, and have in recent years managed to nearly snuff out violence by al-Qaida in the Islamic Maghreb around its home base in northern Algeria. In the meantime, AQIM moved its focus southward.

AQIM has made tens of millions of dollars off kidnapping in the region, abducting Algerian businessmen or politicians, and sometimes foreigners, for ransom.

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